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. 2022 Jun 30;10:881224. doi: 10.3389/fped.2022.881224

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Copyright © 2022 Xu, Liu, Su, Cao, Zhong, Lu, Jia and Xu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Proportions of respiratory pathogens detected in 2020 (February 2020 to January 2021) (A) and 2019 (February 2019 to January 2020) (B) according to age group.